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25 October 2018 Compact plasmonics lens based on nanoslit chain with gradually decreasing widths and separations
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Abstract
We have introduced a novel plasmonics planar slit lens, consisting of five slits with gradually decreasing widths and interspace distances. The cascading constant k to correlate the geometrical parameters with each other is proposed. At specific k values, light propagating through the slits is amplified and shows extraordinary transmission and focusing features beneath the metallic layer that we name it as the cascading effect. The focusing is due to the additional phase imposed on traveling light through the slits and their constructive interference. Numerical simulation Results show that the slit width should not be larger than half wavelength, and the cascading constant should be between 0.3 and 0.4.
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Mehdi Afshari-Bavil, Mingli Dong, Chuanbo Li, Shuai Feng, and Lianqing Zhu "Compact plasmonics lens based on nanoslit chain with gradually decreasing widths and separations", Proc. SPIE 10824, Plasmonics III, 1082403 (25 October 2018); https://doi.org/10.1117/12.2326589
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